Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd00de7494ae8d3…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 01:14:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9d7c977a8ae1b919e653b53e0d80159b SHA-1: 888c607eca05a1e0dd2c7e4fadf3a536c29b5bbe SHA-256: ebd00de7494ae8d3c0ad0be5303a993d2960d3345e1df11d905a03c1e54a5521
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites that promise game hacks and generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to click these links, which likely lead to malicious websites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-spin-hack-game-hack PDF link annotation
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/muscles-legends-roblox-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-hacked-by-blueroes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/what-is-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-items-on-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-no-human-verification-no-download-apps_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3332 22600 bytes
SHA-256: 791478694e4495d7548309ff591b839b9c558bb6d9cd3fa40b73836d42b5a94d
font_01_sfnt_off0000655f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 18180 bytes
SHA-256: a132cedd825d849e0d721dfbb1ea0ac908be68f445a4640ebf6ea6c953a82746

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